Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00b562b803c4670…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 13:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31c5a57699fab40d4a4a7c0b42a9bab3 SHA-1: 0980c1cca05ebcd124c2f24fd6f2e9c04dedbdd5 SHA-256: a00b562b803c4670e93e0a1c50f7236a1fb2217e1296b09debe6c690eb72a9db
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting the primary purpose is to direct users to potentially malicious websites for phishing or malware downloads. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=task+changer+apk+latest+version PDF link annotation
    • https://go2germany.ru/files/file/16564403217.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/xurirefamikiduta.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/lodepupibogexetow.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/25101125075.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/11631745433.pdfIn PDF document text
    • http://dr-temt.ru/images/file/torabinitomubem.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/21151249980.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/6154289415.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/jogemo.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/7555787894.pdfIn PDF document text
    • http://dfanchem.com/upload/files/livewizamixepalu.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/jomexugegasuwebub.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/rolatesafig.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/30tu1rojtonfci6f94nnl95fcs/riwizolozim.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/wavegovekebuvipaxoro.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/24806022922.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1614521f2d894a---parifatewotamav.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/90993710034.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/femirosadesuvaziwap.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/76975935292.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/tagijazutajomudo.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/jebewusesudawe.pdfIn PDF document text
    • http://panova-art.com/files/file/xezawukog.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/remaduvejatu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEB 15904 bytes
SHA-256: 882a191e10d7acfa85910be48506e895d2712b52018bee2e67905607e4fe994e
font_01_sfnt_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 10776 bytes
SHA-256: b444a1fde8b18dfcccbd8f89231af991b8f93c3ae550c4a6a762a278f35f1751

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